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b0e5d90ebc
The vring.c code currently assumes that guest and host endianness match, which is not true for a number of cases: - emulating targets with a different endianness than the host - bi-endian targets, where the correct endianness depends on the virtio device - upcoming support for the virtio-1 standard mandates little-endian accesses even for big-endian targets and hosts Make sure to use accessors that depend on the virtio device. Note that dataplane now needs to be built per-target. Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Fam Zheng <famz@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Tested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1422289602-17874-2-git-send-email-cornelia.huck@de.ibm.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#ifndef VRING_ACCESSORS_H
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#define VRING_ACCESSORS_H
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#include "hw/virtio/virtio_ring.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/virtio-access.h"
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static inline uint16_t vring_get_used_idx(VirtIODevice *vdev, Vring *vring)
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{
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return virtio_tswap16(vdev, vring->vr.used->idx);
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}
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static inline void vring_set_used_idx(VirtIODevice *vdev, Vring *vring,
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uint16_t idx)
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{
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vring->vr.used->idx = virtio_tswap16(vdev, idx);
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}
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static inline uint16_t vring_get_avail_idx(VirtIODevice *vdev, Vring *vring)
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{
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return virtio_tswap16(vdev, vring->vr.avail->idx);
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}
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static inline uint16_t vring_get_avail_ring(VirtIODevice *vdev, Vring *vring,
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int i)
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{
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return virtio_tswap16(vdev, vring->vr.avail->ring[i]);
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}
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static inline void vring_set_used_ring_id(VirtIODevice *vdev, Vring *vring,
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int i, uint32_t id)
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{
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vring->vr.used->ring[i].id = virtio_tswap32(vdev, id);
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}
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static inline void vring_set_used_ring_len(VirtIODevice *vdev, Vring *vring,
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int i, uint32_t len)
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{
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vring->vr.used->ring[i].len = virtio_tswap32(vdev, len);
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}
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static inline uint16_t vring_get_used_flags(VirtIODevice *vdev, Vring *vring)
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{
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return virtio_tswap16(vdev, vring->vr.used->flags);
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}
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static inline uint16_t vring_get_avail_flags(VirtIODevice *vdev, Vring *vring)
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{
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return virtio_tswap16(vdev, vring->vr.avail->flags);
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}
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static inline void vring_set_used_flags(VirtIODevice *vdev, Vring *vring,
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uint16_t flags)
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{
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vring->vr.used->flags |= virtio_tswap16(vdev, flags);
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}
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static inline void vring_clear_used_flags(VirtIODevice *vdev, Vring *vring,
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uint16_t flags)
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{
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vring->vr.used->flags &= virtio_tswap16(vdev, ~flags);
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}
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static inline unsigned int vring_get_num(Vring *vring)
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{
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return vring->vr.num;
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}
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/* Are there more descriptors available? */
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static inline bool vring_more_avail(VirtIODevice *vdev, Vring *vring)
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{
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return vring_get_avail_idx(vdev, vring) != vring->last_avail_idx;
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}
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#endif
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